Added error handling in crafting tasks: recursive pattern check and max time.

CHANGELOG.md

@@ -7,6 +7,8 @@
 - Removed Storage Drawers integration (you can still attach an External Storage to drawers, though) (raoulvdberge)
 - Removed blocking mode in autocrafting (raoulvdberge)
 - Removed the Wrench (raoulvdberge)
+- Rewrote autocrafting (raoulvdberge)
+- Autocrafting tasks that take longer than 5 seconds to calculate are automatically stopped to avoid server strain (raoulvdberge)
 - Added new storage disk system where the storage disk data (items, fluids) are stored off the disk itself, in another file (refinedstorage_disks.dat). The disk itself only stores its ID (raoulvdberge)
 - Changed fluid storage progression to be 64k - 256k - 1024k - 4096k (raoulvdberge)
 - You can no longer put a Filter in filter slots to gain additional filter slots (raoulvdberge)

src/main/java/com/raoulvdberge/refinedstorage/api/autocrafting/task/CraftingTaskErrorType.java

@@ -0,0 +1,15 @@
+package com.raoulvdberge.refinedstorage.api.autocrafting.task;
+
+/**
+ * The error type.
+ */
+public enum CraftingTaskErrorType {
+    /**
+     * When the crafting task would cause too much server strain or is too complex.
+     */
+    TOO_COMPLEX,
+    /**
+     * When one of the used patterns during the calculation reuses itself again and would cause an infinite loop.
+     */
+    RECURSIVE
+}

src/main/java/com/raoulvdberge/refinedstorage/api/autocrafting/task/ICraftingTask.java

@@ -7,6 +7,7 @@ import com.raoulvdberge.refinedstorage.api.util.IStackList;
 import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NBTTagCompound;
 
+import javax.annotation.Nullable;
 import java.util.List;
 
 /**
@@ -15,8 +16,11 @@ import java.util.List;
 public interface ICraftingTask {
     /**
      * Calculates what this task will do, but doesn't run the task yet.
+     *
+     * @return the error, or null if there was no error
      */
-    void calculate();
+    @Nullable
+    ICraftingTaskError calculate();
 
     /**
      * Updates this task.

src/main/java/com/raoulvdberge/refinedstorage/api/autocrafting/task/ICraftingTaskError.java

@@ -0,0 +1,23 @@
+package com.raoulvdberge.refinedstorage.api.autocrafting.task;
+
+import com.raoulvdberge.refinedstorage.api.autocrafting.ICraftingPattern;
+
+import javax.annotation.Nullable;
+
+/**
+ * Returned from {@link ICraftingTask#calculate()} when an error occurs during the calculation.
+ */
+public interface ICraftingTaskError {
+    /**
+     * @return the type
+     */
+    CraftingTaskErrorType getType();
+
+    /**
+     * If this error type is a {@link CraftingTaskErrorType#RECURSIVE}, the recursed pattern will be returned here.
+     *
+     * @return the recursed pattern, or null if this error is not {@link CraftingTaskErrorType#RECURSIVE}
+     */
+    @Nullable
+    ICraftingPattern getRecursedPattern();
+}

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/autocrafting/CraftingManager.java

@@ -6,6 +6,7 @@ import com.raoulvdberge.refinedstorage.api.autocrafting.ICraftingPatternContaine
 import com.raoulvdberge.refinedstorage.api.autocrafting.craftingmonitor.ICraftingMonitorListener;
 import com.raoulvdberge.refinedstorage.api.autocrafting.registry.ICraftingTaskFactory;
 import com.raoulvdberge.refinedstorage.api.autocrafting.task.ICraftingTask;
+import com.raoulvdberge.refinedstorage.api.autocrafting.task.ICraftingTaskError;
 import com.raoulvdberge.refinedstorage.api.network.node.INetworkNode;
 import com.raoulvdberge.refinedstorage.api.util.IComparer;
 import com.raoulvdberge.refinedstorage.apiimpl.API;
@@ -138,14 +139,15 @@ public class CraftingManager implements ICraftingManager {
             ICraftingTask task = create(stack, toSchedule);
 
             if (task != null) {
-                task.calculate();
+                ICraftingTaskError error = task.calculate();
 
+                if (error == null) {
                     this.add(task);
-                this.onTaskChanged();
 
                     return task;
                 }
             }
+        }
 
         return null;
     }

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/autocrafting/preview/CraftingPreviewElementError.java

@@ -1,6 +1,7 @@
 package com.raoulvdberge.refinedstorage.apiimpl.autocrafting.preview;
 
 import com.raoulvdberge.refinedstorage.api.autocrafting.preview.ICraftingPreviewElement;
+import com.raoulvdberge.refinedstorage.api.autocrafting.task.CraftingTaskErrorType;
 import com.raoulvdberge.refinedstorage.api.render.IElementDrawers;
 import io.netty.buffer.ByteBuf;
 import net.minecraft.item.Item;
@@ -11,9 +12,11 @@ import net.minecraftforge.fml.common.network.ByteBufUtils;
 public class CraftingPreviewElementError implements ICraftingPreviewElement<ItemStack> {
     public static final String ID = "error";
 
+    private CraftingTaskErrorType type;
     private ItemStack stack;
 
-    public CraftingPreviewElementError(ItemStack stack) {
+    public CraftingPreviewElementError(CraftingTaskErrorType type, ItemStack stack) {
+        this.type = type;
         this.stack = stack;
     }
 
@@ -39,17 +42,25 @@ public class CraftingPreviewElementError implements ICraftingPreviewElement<Item
 
     @Override
     public boolean hasMissing() {
-        return true;
+        return false;
     }
 
     @Override
     public void writeToByteBuf(ByteBuf buf) {
+        buf.writeInt(type.ordinal());
         buf.writeInt(Item.getIdFromItem(stack.getItem()));
         buf.writeInt(stack.getMetadata());
         ByteBufUtils.writeTag(buf, stack.getTagCompound());
     }
 
+    public CraftingTaskErrorType getType() {
+        return type;
+    }
+
     public static CraftingPreviewElementError fromByteBuf(ByteBuf buf) {
+        int errorIdx = buf.readInt();
+        CraftingTaskErrorType error = errorIdx >= 0 && errorIdx < CraftingTaskErrorType.values().length ? CraftingTaskErrorType.values()[errorIdx] : CraftingTaskErrorType.TOO_COMPLEX;
+
         Item item = Item.getItemById(buf.readInt());
         int meta = buf.readInt();
         NBTTagCompound tag = ByteBufUtils.readTag(buf);
@@ -57,7 +68,7 @@ public class CraftingPreviewElementError implements ICraftingPreviewElement<Item
         ItemStack stack = new ItemStack(item, 1, meta);
         stack.setTagCompound(tag);
 
-        return new CraftingPreviewElementError(stack);
+        return new CraftingPreviewElementError(error, stack);
     }
 
     @Override

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/autocrafting/task/CraftingTask.java

@@ -4,7 +4,9 @@ import com.raoulvdberge.refinedstorage.api.autocrafting.ICraftingPattern;
 import com.raoulvdberge.refinedstorage.api.autocrafting.craftingmonitor.ICraftingMonitorElement;
 import com.raoulvdberge.refinedstorage.api.autocrafting.craftingmonitor.ICraftingMonitorElementList;
 import com.raoulvdberge.refinedstorage.api.autocrafting.preview.ICraftingPreviewElement;
+import com.raoulvdberge.refinedstorage.api.autocrafting.task.CraftingTaskErrorType;
 import com.raoulvdberge.refinedstorage.api.autocrafting.task.ICraftingTask;
+import com.raoulvdberge.refinedstorage.api.autocrafting.task.ICraftingTaskError;
 import com.raoulvdberge.refinedstorage.api.network.INetwork;
 import com.raoulvdberge.refinedstorage.api.util.IComparer;
 import com.raoulvdberge.refinedstorage.api.util.IStackList;
@@ -24,17 +26,23 @@ import com.raoulvdberge.refinedstorage.apiimpl.autocrafting.task.step.CraftingSt
 import net.minecraft.item.ItemStack;
 import net.minecraft.nbt.NBTTagCompound;
 import net.minecraft.util.NonNullList;
+import org.apache.commons.lang3.tuple.Pair;
 
+import javax.annotation.Nullable;
 import java.util.*;
 
 public class CraftingTask implements ICraftingTask {
+    private static final long CALCULATION_TIMEOUT_MS = 5000;
+
     private INetwork network;
     private ItemStack requested;
     private int quantity;
     private ICraftingPattern pattern;
     private List<CraftingStep> steps = new LinkedList<>();
     private CraftingInserter inserter;
+    private Set<ICraftingPattern> patternsUsed = new HashSet<>();
     private int ticks = 0;
+    private long calculationStarted;
 
     private IStackList<ItemStack> toTake = API.instance().createItemStackList();
     private IStackList<ItemStack> missing = API.instance().createItemStackList();
@@ -49,7 +57,10 @@ public class CraftingTask implements ICraftingTask {
     }
 
     @Override
-    public void calculate() {
+    @Nullable
+    public ICraftingTaskError calculate() {
+        this.calculationStarted = System.currentTimeMillis();
+
         int qty = this.quantity;
         int qtyPerCraft = getQuantityPerCraft(pattern, requested);
         int crafted = 0;
@@ -58,7 +69,13 @@ public class CraftingTask implements ICraftingTask {
         IStackList<ItemStack> storage = network.getItemStorageCache().getList().copy();
 
         while (qty > 0) {
-            this.steps.add(calculateInternal(storage, results, pattern));
+            Pair<CraftingStep, ICraftingTaskError> result = calculateInternal(storage, results, pattern);
+
+            if (result.getRight() != null) {
+                return result.getRight();
+            }
+
+            this.steps.add(result.getLeft());
 
             qty -= qtyPerCraft;
 
@@ -66,9 +83,19 @@ public class CraftingTask implements ICraftingTask {
         }
 
         this.toCraft.add(requested, crafted);
+
+        return null;
+    }
+
+    private Pair<CraftingStep, ICraftingTaskError> calculateInternal(IStackList<ItemStack> mutatedStorage, IStackList<ItemStack> results, ICraftingPattern pattern) {
+        if (System.currentTimeMillis() - calculationStarted > CALCULATION_TIMEOUT_MS) {
+            return Pair.of(null, new CraftingTaskError(CraftingTaskErrorType.TOO_COMPLEX));
+        }
+
+        if (!patternsUsed.add(pattern)) {
+            return Pair.of(null, new CraftingTaskError(CraftingTaskErrorType.RECURSIVE, pattern));
         }
 
-    private CraftingStep calculateInternal(IStackList<ItemStack> mutatedStorage, IStackList<ItemStack> results, ICraftingPattern pattern) {
         IStackList<ItemStack> itemsToExtract = API.instance().createItemStackList();
 
         NonNullList<ItemStack> took = NonNullList.create();
@@ -140,7 +167,13 @@ public class CraftingTask implements ICraftingTask {
 
                     if (subPattern != null) {
                         while ((fromSelf == null ? 0 : fromSelf.getCount()) < remaining) {
-                            this.steps.add(calculateInternal(mutatedStorage, results, subPattern));
+                            Pair<CraftingStep, ICraftingTaskError> result = calculateInternal(mutatedStorage, results, subPattern);
+
+                            if (result.getRight() != null) {
+                                return Pair.of(null, result.getRight());
+                            }
+
+                            this.steps.add(result.getLeft());
 
                             fromSelf = results.get(possibleInput);
                             if (fromSelf == null) {
@@ -161,12 +194,14 @@ public class CraftingTask implements ICraftingTask {
             }
         }
 
+        patternsUsed.remove(pattern);
+
         if (pattern.isProcessing()) {
             for (ItemStack output : pattern.getOutputs()) {
                 results.add(output);
             }
 
-            return new CraftingStepProcess(pattern, network, new ArrayList<>(itemsToExtract.getStacks()));
+            return Pair.of(new CraftingStepProcess(pattern, network, new ArrayList<>(itemsToExtract.getStacks())), null);
         } else {
             results.add(pattern.getOutput(took));
 
@@ -174,7 +209,7 @@ public class CraftingTask implements ICraftingTask {
                 results.add(byproduct);
             }
 
-            return new CraftingStepCraft(pattern, inserter, network, new ArrayList<>(itemsToExtract.getStacks()), took);
+            return Pair.of(new CraftingStepCraft(pattern, inserter, network, new ArrayList<>(itemsToExtract.getStacks()), took), null);
         }
     }
 

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/autocrafting/task/CraftingTaskError.java

@@ -0,0 +1,32 @@
+package com.raoulvdberge.refinedstorage.apiimpl.autocrafting.task;
+
+import com.raoulvdberge.refinedstorage.api.autocrafting.ICraftingPattern;
+import com.raoulvdberge.refinedstorage.api.autocrafting.task.CraftingTaskErrorType;
+import com.raoulvdberge.refinedstorage.api.autocrafting.task.ICraftingTaskError;
+
+import javax.annotation.Nullable;
+
+public class CraftingTaskError implements ICraftingTaskError {
+    private CraftingTaskErrorType type;
+    private ICraftingPattern recursedPattern;
+
+    public CraftingTaskError(CraftingTaskErrorType type) {
+        this.type = type;
+    }
+
+    public CraftingTaskError(CraftingTaskErrorType type, ICraftingPattern recursedPattern) {
+        this.type = type;
+        this.recursedPattern = recursedPattern;
+    }
+
+    @Override
+    public CraftingTaskErrorType getType() {
+        return type;
+    }
+
+    @Override
+    @Nullable
+    public ICraftingPattern getRecursedPattern() {
+        return recursedPattern;
+    }
+}

src/main/java/com/raoulvdberge/refinedstorage/apiimpl/network/grid/handler/ItemGridHandler.java

@@ -4,6 +4,7 @@ import com.raoulvdberge.refinedstorage.RS;
 import com.raoulvdberge.refinedstorage.api.autocrafting.ICraftingManager;
 import com.raoulvdberge.refinedstorage.api.autocrafting.ICraftingPattern;
 import com.raoulvdberge.refinedstorage.api.autocrafting.task.ICraftingTask;
+import com.raoulvdberge.refinedstorage.api.autocrafting.task.ICraftingTaskError;
 import com.raoulvdberge.refinedstorage.api.network.INetwork;
 import com.raoulvdberge.refinedstorage.api.network.grid.handler.IItemGridHandler;
 import com.raoulvdberge.refinedstorage.api.network.item.INetworkItem;
@@ -11,6 +12,7 @@ import com.raoulvdberge.refinedstorage.api.network.item.NetworkItemAction;
 import com.raoulvdberge.refinedstorage.api.network.security.Permission;
 import com.raoulvdberge.refinedstorage.api.util.IStackList;
 import com.raoulvdberge.refinedstorage.apiimpl.API;
+import com.raoulvdberge.refinedstorage.apiimpl.autocrafting.preview.CraftingPreviewElementError;
 import com.raoulvdberge.refinedstorage.network.MessageGridCraftingPreviewResponse;
 import com.raoulvdberge.refinedstorage.network.MessageGridCraftingStartResponse;
 import com.raoulvdberge.refinedstorage.util.StackUtils;
@@ -21,6 +23,8 @@ import net.minecraftforge.items.CapabilityItemHandler;
 import net.minecraftforge.items.IItemHandler;
 import net.minecraftforge.items.ItemHandlerHelper;
 
+import java.util.Collections;
+
 public class ItemGridHandler implements IItemGridHandler {
     private INetwork network;
 
@@ -187,9 +191,11 @@ public class ItemGridHandler implements IItemGridHandler {
                     return;
                 }
 
-                task.calculate();
+                ICraftingTaskError error = task.calculate();
 
-                if (noPreview && task.getMissing().isEmpty()) {
+                if (error != null) {
+                    RS.INSTANCE.network.sendTo(new MessageGridCraftingPreviewResponse(Collections.singletonList(new CraftingPreviewElementError(error.getType(), error.getRecursedPattern() == null ? ItemStack.EMPTY : error.getRecursedPattern().getStack())), hash, quantity), player);
+                } else if (noPreview && task.getMissing().isEmpty()) {
                     network.getCraftingManager().add(task);
 
                     RS.INSTANCE.network.sendTo(new MessageGridCraftingStartResponse(), player);
@@ -230,11 +236,12 @@ public class ItemGridHandler implements IItemGridHandler {
                 return;
             }
 
-            task.calculate();
+            ICraftingTaskError error = task.calculate();
-
+            if (error == null) {
                 network.getCraftingManager().add(task);
             }
         }
+    }
 
     @Override
     public void onCraftingCancelRequested(EntityPlayerMP player, int id) {

src/main/java/com/raoulvdberge/refinedstorage/gui/GuiCraftingPreview.java

@@ -3,6 +3,7 @@ package com.raoulvdberge.refinedstorage.gui;
 import com.raoulvdberge.refinedstorage.RS;
 import com.raoulvdberge.refinedstorage.api.autocrafting.ICraftingPattern;
 import com.raoulvdberge.refinedstorage.api.autocrafting.preview.ICraftingPreviewElement;
+import com.raoulvdberge.refinedstorage.api.autocrafting.task.CraftingTaskErrorType;
 import com.raoulvdberge.refinedstorage.api.render.IElementDrawer;
 import com.raoulvdberge.refinedstorage.api.render.IElementDrawers;
 import com.raoulvdberge.refinedstorage.apiimpl.autocrafting.preview.CraftingPreviewElementError;
@@ -25,6 +26,7 @@ import net.minecraftforge.fluids.FluidStack;
 import net.minecraftforge.fml.client.FMLClientHandler;
 import org.lwjgl.input.Keyboard;
 
+import javax.annotation.Nullable;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
@@ -77,7 +79,7 @@ public class GuiCraftingPreview extends GuiBase {
     public void init(int x, int y) {
         cancelButton = addButton(x + 16, y + 144, 50, 20, t("gui.cancel"));
         startButton = addButton(x + 85, y + 144, 50, 20, t("misc.refinedstorage:start"));
-        startButton.enabled = stacks.stream().noneMatch(ICraftingPreviewElement::hasMissing);
+        startButton.enabled = stacks.stream().noneMatch(ICraftingPreviewElement::hasMissing) && getErrorType() == null;
     }
 
     @Override
@@ -87,13 +89,18 @@ public class GuiCraftingPreview extends GuiBase {
             scrollbar.setMaxOffset(getRows() - VISIBLE_ROWS);
         }
 
-        if (startButton != null && !startButton.enabled && isCtrlKeyDown() && isShiftKeyDown()) {
+        if (startButton != null && !startButton.enabled && isCtrlKeyDown() && isShiftKeyDown() && getErrorType() == null) {
             startButton.enabled = true;
         }
     }
 
-    private boolean hasErrored() {
+    @Nullable
-        return stacks.size() == 1 && stacks.get(0) instanceof CraftingPreviewElementError;
+    private CraftingTaskErrorType getErrorType() {
+        if (stacks.size() == 1 && stacks.get(0) instanceof CraftingPreviewElementError) {
+            return ((CraftingPreviewElementError) stacks.get(0)).getType();
+        }
+
+        return null;
     }
 
     @Override
@@ -102,7 +109,7 @@ public class GuiCraftingPreview extends GuiBase {
 
         drawTexture(x, y, 0, 0, screenWidth, screenHeight);
 
-        if (hasErrored()) {
+        if (getErrorType() != null) {
             drawRect(x + 7, y + 20, x + 142, y + 139, 0xFFDBDBDB);
         }
     }
@@ -116,28 +123,31 @@ public class GuiCraftingPreview extends GuiBase {
 
         float scale = fontRenderer.getUnicodeFlag() ? 1F : 0.5F;
 
-        if (hasErrored()) {
+        if (getErrorType() != null) {
             GlStateManager.pushMatrix();
             GlStateManager.scale(scale, scale, 1);
 
-            drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 10, scale), t("gui.refinedstorage:crafting_preview.error.0"));
+            drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 11, scale), t("gui.refinedstorage:crafting_preview.error"));
-            drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 20, scale), t("gui.refinedstorage:crafting_preview.error.1"));
-            drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 30, scale), t("gui.refinedstorage:crafting_preview.error.2"));
-            drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 40, scale), t("gui.refinedstorage:crafting_preview.error.3"));
-            drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 50, scale), t("gui.refinedstorage:crafting_preview.error.4"));
 
-            drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 60, scale), t("gui.refinedstorage:crafting_preview.error.5"));
+            switch (getErrorType()) {
+                case RECURSIVE: {
+                    drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 21, scale), t("gui.refinedstorage:crafting_preview.error.recursive.0"));
+                    drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 31, scale), t("gui.refinedstorage:crafting_preview.error.recursive.1"));
+                    drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 41, scale), t("gui.refinedstorage:crafting_preview.error.recursive.2"));
+                    drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 51, scale), t("gui.refinedstorage:crafting_preview.error.recursive.3"));
+
+                    drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 61, scale), t("gui.refinedstorage:crafting_preview.error.recursive.4"));
 
                     GlStateManager.popMatrix();
 
                     ICraftingPattern pattern = ItemPattern.getPatternFromCache(parent.mc.world, (ItemStack) stacks.get(0).getElement());
 
-            int yy = 80;
+                    int yy = 83;
                     for (ItemStack output : pattern.getOutputs()) {
                         if (output != null) {
                             GlStateManager.pushMatrix();
                             GlStateManager.scale(scale, scale, 1);
-                    drawString(RenderUtils.getOffsetOnScale(x + 25, scale), RenderUtils.getOffsetOnScale(yy + 7, scale), output.getDisplayName());
+                            drawString(RenderUtils.getOffsetOnScale(x + 25, scale), RenderUtils.getOffsetOnScale(yy + 6, scale), output.getDisplayName());
                             GlStateManager.popMatrix();
 
                             RenderHelper.enableGUIStandardItemLighting();
@@ -148,6 +158,18 @@ public class GuiCraftingPreview extends GuiBase {
                             yy += 17;
                         }
                     }
+
+                    break;
+                }
+                case TOO_COMPLEX: {
+                    drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 21, scale), t("gui.refinedstorage:crafting_preview.error.too_complex.0"));
+                    drawString(RenderUtils.getOffsetOnScale(x + 5, scale), RenderUtils.getOffsetOnScale(y + 31, scale), t("gui.refinedstorage:crafting_preview.error.too_complex.1"));
+
+                    GlStateManager.popMatrix();
+
+                    break;
+                }
+            }
         } else {
             int slot = scrollbar != null ? (scrollbar.getOffset() * 2) : 0;
 

src/main/java/com/raoulvdberge/refinedstorage/integration/oc/EnvironmentNetwork.java

@@ -2,6 +2,7 @@ package com.raoulvdberge.refinedstorage.integration.oc;
 
 import com.raoulvdberge.refinedstorage.api.autocrafting.ICraftingPattern;
 import com.raoulvdberge.refinedstorage.api.autocrafting.task.ICraftingTask;
+import com.raoulvdberge.refinedstorage.api.autocrafting.task.ICraftingTaskError;
 import com.raoulvdberge.refinedstorage.api.network.node.INetworkNode;
 import com.raoulvdberge.refinedstorage.api.util.IComparer;
 import com.raoulvdberge.refinedstorage.apiimpl.API;
@@ -129,9 +130,11 @@ public class EnvironmentNetwork extends AbstractManagedEnvironment {
             throw new IllegalArgumentException("Could not create crafting task");
         }
 
-        task.calculate();
+        ICraftingTaskError error = task.calculate();
 
+        if (error == null) {
             node.getNetwork().getCraftingManager().add(task);
+        }
 
         return new Object[]{};
     }

src/main/resources/assets/refinedstorage/lang/en_us.lang

@@ -55,12 +55,14 @@ gui.refinedstorage:crafting_preview=Crafting Preview
 gui.refinedstorage:crafting_preview.to_craft=To craft: %d
 gui.refinedstorage:crafting_preview.available=Available: %d
 gui.refinedstorage:crafting_preview.missing=Missing: %d
-gui.refinedstorage:crafting_preview.error.0=Cannot craft
+gui.refinedstorage:crafting_preview.error=Request failed
-gui.refinedstorage:crafting_preview.error.1=One of the crafting ingredients ended up needing
+gui.refinedstorage:crafting_preview.error.recursive.0=One of the crafting ingredients ended up needing
-gui.refinedstorage:crafting_preview.error.2=itself.
+gui.refinedstorage:crafting_preview.error.recursive.1=itself.
-gui.refinedstorage:crafting_preview.error.3=You need to remove the pattern or make sure
+gui.refinedstorage:crafting_preview.error.recursive.2=You need to remove the pattern or make sure
-gui.refinedstorage:crafting_preview.error.4=the pattern is not used during crafting.
+gui.refinedstorage:crafting_preview.error.recursive.3=the pattern is not used during crafting.
-gui.refinedstorage:crafting_preview.error.5=Offending pattern:
+gui.refinedstorage:crafting_preview.error.recursive.4=Offending pattern:
+gui.refinedstorage:crafting_preview.error.too_complex.0=The crafting task calculation was too complex
+gui.refinedstorage:crafting_preview.error.too_complex.1=and was stopped to avoid server strain.
 gui.refinedstorage:crafting_preview.force_start=Press CTRL + SHIFT to ignore
 gui.refinedstorage:reader=Reader
 gui.refinedstorage:writer=Writer

src/main/resources/assets/refinedstorage/lang/es_es.lang

@@ -52,12 +52,12 @@ gui.refinedstorage:crafting_preview=Avance de Fabricación
 gui.refinedstorage:crafting_preview.to_craft=Para fabricar: %d
 gui.refinedstorage:crafting_preview.available=Disponible: %d
 gui.refinedstorage:crafting_preview.missing=Falta: %d
-gui.refinedstorage:crafting_preview.error.0=No puede fabricar
+gui.refinedstorage:crafting_preview.error=No puede fabricar
-gui.refinedstorage:crafting_preview.error.1=Uno de los objetos de creación termino faltando
+gui.refinedstorage:crafting_preview.error.recursive.0=Uno de los objetos de creación termino faltando
-gui.refinedstorage:crafting_preview.error.2=sí mismo.
+gui.refinedstorage:crafting_preview.error.recursive.1=sí mismo.
-gui.refinedstorage:crafting_preview.error.3=Necesita remover el patrón o revisarlo
+gui.refinedstorage:crafting_preview.error.recursive.2=Necesita remover el patrón o revisarlo
-gui.refinedstorage:crafting_preview.error.4=el patrón no se usa para la fabricación.
+gui.refinedstorage:crafting_preview.error.recursive.3=el patrón no se usa para la fabricación.
-gui.refinedstorage:crafting_preview.error.5=Patrón ofensivo:
+gui.refinedstorage:crafting_preview.error.recursive.4=Patrón ofensivo:
 gui.refinedstorage:crafting_preview.force_start=Presiona CTRL + SHIFT para forzar el inicio
 gui.refinedstorage:reader=Lector
 gui.refinedstorage:writer=Escritor

src/main/resources/assets/refinedstorage/lang/ru_ru.lang

@@ -52,12 +52,12 @@ gui.refinedstorage:crafting_preview=Предварительный просмо
 gui.refinedstorage:crafting_preview.to_craft=Создать: %d
 gui.refinedstorage:crafting_preview.available=Доступно: %d
 gui.refinedstorage:crafting_preview.missing=Отсутствует: %d
-gui.refinedstorage:crafting_preview.error.0=Не удается создать
+gui.refinedstorage:crafting_preview.error=Не удается создать
-gui.refinedstorage:crafting_preview.error.1=Один из ингредиентов для крафта оказался нуждающимся
+gui.refinedstorage:crafting_preview.error.recursive.0=Один из ингредиентов для крафта оказался нуждающимся
-gui.refinedstorage:crafting_preview.error.2=в себе.
+gui.refinedstorage:crafting_preview.error.recursive.1=в себе.
-gui.refinedstorage:crafting_preview.error.3=Вам нужно удалить шаблон или убедиться, что
+gui.refinedstorage:crafting_preview.error.recursive.2=Вам нужно удалить шаблон или убедиться, что
-gui.refinedstorage:crafting_preview.error.4=шаблон не используется во время обработки.
+gui.refinedstorage:crafting_preview.error.recursive.3=шаблон не используется во время обработки.
-gui.refinedstorage:crafting_preview.error.5=Нарушение шаблона:
+gui.refinedstorage:crafting_preview.error.recursive.4=Нарушение шаблона:
 gui.refinedstorage:crafting_preview.force_start=Нажмите CTRL + SHIFT, чтобы все равно начать
 gui.refinedstorage:reader=Устройство чтения
 gui.refinedstorage:writer=Устройство записи